Made a little boo boo
 

I had a spare center iron I'm using for a cheap experimental motor. So when it comes to experimenting, I was pushing the limits of the porting. I actually ported the bottom edge of the bridge port deep enough to create a small hole into the coolant passage. The hole is maybe a 1/6" of an inch around.

I want to know if i can just JB weld it shut (as i was planning on JB welding a few areas anyways for better transition). This is an NA motor and will not see boost. I know that JB weld will withstand the heat, but will it keep the water from seeping in under pressure? How much pressure do the coolant passages actually see? I don't imagine it being much...

Well, what pressure of radiator cap do you use? Add 0.46 psi per foot of elevation below the cap.

I would worry slightly about the difference in the thermal expansion rate of the JB weld and steel.

I have (and many other) have used JB weld in the ports. So I'm not worried at all about the JB weld bonding. The only thing that worries me is if it will keep the coolant from seeping in. I have used it to block water/coolant in manifold/TB's and other things. But never to block water in the motor.

I'm pretty sure it will. But I'm wondering if anyone here has already done this before?

why not just regular weld it?

Welding on the plates is a lot easier said than done. Not that it's impossible, but it's not recommended.

I already checked everything with a spare rotor. It all checks out fine. I was just being over cautious. Side seal leading edge stays supported the entire time.

Should work. Obviously not ideal, and obviously there's a chance of failure...but it should work. Just build it up nice on the inside of the passage a good amount larger then the hole.

Devcon, expensive, Racing Beat sells it, and has characteristics similar to Irons. It's whats used to fill in the intake ports when using a Peripheral Port.

http://racingbeat.com/photos/19994.jpg


When building a peripheral port engine it is necessary to fill the intake ports on the cast iron side housings with a material that will form a tough, durable metallic mass - Devcon Plastic Steel Putty (10110) is the material of choice. Easy to use and requiring minimal clean up, Devcon cures at room temperature. Each container of Devcon will be sufficient to complete several engines.

$49.75/Tub

wow, this is awesome! I didn't know that there is something like this available!